Bytans (バイタン, Bitan) are enemies in Super Smash Bros. Brawl's Subspace Emissary mode that first appear in the Ruined Zoo level. Bytans can duplicate themselves within seconds, forcing the player to destroy them quickly before things get out of hand; they attack more on lower difficulties while multiplying faster on higher ones. Bytans come in nine different colors: red, orange, yellow, green, blue, purple, pink, brown, and black. They often appear in ambushes, so that they can reproduce more and make it harder for the player to defeat.

There are also giant-sized Bytans, which are about four times larger and have roughly three times more health. Giant Bytans are far less likely to multiply.

A spherical creature divided into two colors. There's a big, staring eye in the colored section, and the white part contains the creature's gaping mouth and exposed fangs. It rolls along and smashes into all enemies it meets. After a short time, it will pop another Bytan out of its eye, so if you leave it alone, it will continue to produce one Bytan after another.

These spherical enemies made their first appearance in Super Smash Bros. Brawl. They have a white portion underneath with sharklike teeth and an upper portion with a giant red eye. They attack by rolling straight into you. Try not to leave them alone for too long—they multiply by popping more Bytans out of their eyes!